Door check



1940- J. J. JONES DOOR CHECK Filed Oct. 31. 1939 James J Jones INVENTOR Patented J uly, 30, 1940 y-U N'ITED STATES PATENT v; OFFICE I DOOR CHECK James J. Jones,".l ulsa, kla.

Application October 31, 1939,. SerialNo. 302,221

7 Claims. (01. lee- 45':

' Theinvention relates todoorchecks, particularly'adapted'for use in connection with spring closed doors;- for instance screens, and has for its object to provide a check comprising a cylinder having a piston therein and a rod extending through 'one'end ofthe cylinder and terminating inan aperturediportion adapted to engage a hook on the doorframe when the door is closed, and

, also whenthe door is partially opened and to em disengage from the hook after the piston is movedin the cylinder and when the door approaches its open position. Also to provide means adjacent the hook for guiding the eye onto the hook as the door approaches closed position, and at the same time moving the piston rod and piston longitudinally in the cylinder for a door checking operation.

A further object is to form the piston rod within the cylinder from "connected sections, thereby allowing the .piston section to have a limited floating movement in relation to the other section, thereby r obviating wear on the piston or-cup incident to side pressure which is the common difficulty with devices at present constructed.

A'further object is topivotally mount the cylinder on the door for movement in a horizontal plane, and to provide spring means for normally urging one endof the cylinder towards an adjustable stop carried by the door, thereby allowing the eye of the piston to be accurately adjusted for cooperation "with-the hook carried by the'frame.

A further object is to provide a knock-off E35 lug adjacent the hook for engaging the outer end of the piston as the doorapproaches open position for disengaging the rod from the hook.

A'further object isitolform the piston rod from fiat material and with abend therein for a floating-connection of the cup carried section of the rod and a guide disc to the rear of the cup and carried by the fiat section of the rod and through which the cup carried section extends, and has lateral play.

45 With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise 50 embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing: Figure 1 is a horizontal sectional view through 55 the door check cylinder.

or not.

Figure 2 is-a-top plan view of the door check and a door, showing,'in dotted-lines, the various positions of the checkduring the opening and closing operations.

Figure 3 is a horizontal sectional view through 5 oneend of the piston rod and a portion of the door frame 'showing thepis'ton rod end in checking position when the door is approaching closed position. v

Referring to thedrawing, the numeral l desighates a'conventional" form of door and which door is connected to the side of a door frame'Z by means of conventional spring hinges 3, and

which spring hirigesnonnally urge the door I towards closed position.

Rockably mounted at 4 on a plate 5 carried by the innerside of'the door I is a cylinder'fi,

adjustable'stop 8 carried by the door. It will be noted that the adjustable stop is in the form .325 of ascrew which-maybe screwed inwardly or outwardly, howeverany other form may beused.

In checks as atp'res'ent constructed their piston rods are formed in one piece; consequently the pistons 9 and bearings ID in the cap ll wear to such an extent the checks are inefiicient. To overcome'this objection applicants piston rod 12 is formed from a fiat or round material and -is provided with a U-shaped bend l3 intermediate its ends. "The rear end I30, of the section 5 l 2 terminatesina 'transverse'portion M to which is connecteda fibre-guide washer, l5, which engages the inner;periphery of 1the-cylinder6. It will be noted. that itmakes no'difference whether wear takes place on'the sides ;of'the washer I5 The other section l2w ofthe piston rod extends through an enlarged aperture IS in one of the arms of the U-shaped portion I3 and has a bearing engagement at IT in the other arm and also a washer l8 and cotter key l9 for connect- 5 ing the piston rod sections together.

It will be noted that there is a slight floating connection of the piston rod sections in relation to each other. The piston rod section I2a extends rearwardly through enlarged apertures 20 in the arm I4 and guide washer l5, and has connected to its rearend the cup shaped piston 9; therefore it will be seen that lateral strain will not be imparted to the cup 9 which causes wear on opposite sides thereof as it is reciprocated from time to time during the door opening and closing operations. When the piston 9 moves forwardly air is sucked into the rear end of the cylinder through a port 2| and past the flap valve 22 which islimited in its opening position by the stop 23. Port 2| is sufliciently large to admit sufficient air to prevent the formation of a vacuum within the cylinder, which would render the door hard to open. On the reverse movement of the piston 9, when the door is approaching closed position, the flap valve 22 is closed and the air in the rear end of the cylinder is compressed and bled to the atmosphere through the exhaust port 24, which exhaust port may be regulated in size by the adjusting screw 25.

The forward or outer end of the flat portion l2 of the piston rod terminates in an acutely angled portion 26 having ahook receiving aperture 27 in the outer end thereof. When the door is in closed position, as shown in Figure 2, the hook 28 carried by the door frame bracket 29 is disposed within the aperture 21. As the door is swung open on its hinges it will be noted that the piston rod l2 will be pulled outwardly from the cylinder thereby intaking air through the port 2!. As the door continues its movement towards open position the knock-off lug 30, carried by the plate 29, will engage the acutely angled portion 26 and positively disengage the rod from the hook 28, thereby allowing the door to swing a maximum distance towards open position. It will be noted that the knock-off lug 30 is V- shaped and that it rides into the aperture 210. in the rod during the opening and closing operation. The stop screw 8 is adjusted inwardly or outwardly for limiting the inward movement of the inner end of the cylinder so the hook 28 will be received in the aperture 211.

When the door is released and is moved towards closed position by its spring hinges 3, the outer end of the piston rod will engage the flange 3! carried by the plate 29, and will be guided inwardly as clearly shown in Figure 3 where the hook 28 will be received in the aperture 27. The further closing operation ofthe door will cause a longitudinal outward movement of the piston 9 in the cylinder for checking the closing of the door so the door will not slam.

By forming the piston rod section l2 flat, it is obvious a wide bearing surface may be obtained at l0, however it is to be understood that applicant may use a round rod if desired without departing from the spirit of the invention.

From the above it will be seen that a door check is provided of the disconnecting type, simple in construction, positive in its operations and one wherein the wear on the piston and piston rod bearing is reduced to a minimum.

The invention having been set forth what is claimed as new and useful is:

1. The combination with a door check comprising a cylinder, a piston reciprocally mounted within said cylinder, of a piston rod connected to said piston and to a stationary member adjacent a door, said piston rod being formed from a plurality of sections having limited floating connections within the cylinder.

2. The combination with a door check cylinder carried by a hinged door hingedly connected to a door frame, a piston reciprocally mounted within said cylinder, a piston rod within the cylinder and connected to the door frame, said piston rod being formed from a plurality of sections having limited floating connections.

3. A device as set forth in claim 2 wherein the portion of the piston rod connected to the door frame terminates in a guide disc adjacent the piston and the other section of said piston rod extending through an enlarged aperture in the guide disc.

4. A device as set forth in claim 2 wherein the portion of the piston rod connected to the door frame is provided with a transverse U-shaped portion forming spaced arms, one end of the other section of the piston rod extending through an enlarged aperture in one of the arms of the U-shaped portion and having a bearing against the other arm of the U-shaped portion, said last named piston rod section extending rearwardly and connected to the piston, said first mentioned portion of the piston rod being disposed to one side of the piston carried portion and a guide disc spring means for normally forcing the outer end of the cylinder towards the door, a piston within the cylinder, 2. piston rod connected to said piston and extending towards the door frame, a hook carried by the door frame and adapted to be received in an eye of the piston rod when the door is in closed position and a knock-off lug adjacent the hook and positioned to engage the piston rod for disengaging the eye from the hook when the door is moved to open position.

6. A device as set forth in claim 5 including a.

guide lug carried by the door frame and positioned to engage the end of the piston rod when the door is moved to closed position and guide the eye onto the hook.

'7. A device as set forth in claim 5 wherein the outer end of the piston rod is at an obtuse angle to the other portions thereof and the knockoff lug positioned to engage the point of angling of said portions. I

JAMES J. JONES. 

